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Chicago • It will make you stronger. It will give you peace of mind and make you feel like a winner. Health insurance is what the whole country has been talking about, so don't be left out.

Sound like a sales pitch? Get ready for a lot more. As President Barack Obama's health care law moves from theory to reality in the coming months, its success may hinge on whether the best minds in advertising can reach one of the hardest-to-find parts of the population: people without health coverage.

The campaign won't come cheap: The amount to be spent nationally on publicity, marketing and advertising will be at least $684 million, according to data compiled by The Associated Press from federal and state sources.

About 16 percent of Americans are uninsured, but despite years of political debate and media attention, more than three-quarters of them still know little about the law known as "Obamacare," according to recent surveys.

"It's not sugar cereal, beer and detergent," said Brooke Foley, chief executive officer of the Chicago-based Jayne Agency, one of the advertising firms crafting messages to reach the uninsured.

The Obama administration and many states are launching campaigns this summer to get the word out before enrollment for new benefits begins in October.

The targets are mostly the working poor, young people who are disengaged, or those who gave up their insurance because of the cost. Three-quarters are white. Eighty-six percent have a high school education or less. Together they make up a blind spot in the nation's health care system.

"They've been shut out. It's too expensive and it's incredibly confusing," said David Smith of the advertising agency GMMB, pitching the health law's benefits in Washington and Vermont.

Their confusion might only have been magnified by the administration's surprise announcement recently postponing part of the system that affects businesses. But that change should not affect many individuals. A bigger complication is that in about half the states, Republican governors are declining to cooperate, which will limit the marketing. The states that have been more receptive to the health care overhaul and are further ahead in their planning will receive proportionally more federal money for outreach, advertising and marketing than Republican-led states that have been hostile to the law.

AP research from all 50 states shows the amount of government spending will range from a low of 46 cents per capita in Wisconsin, which has ceded responsibility for its health insurance exchange to the federal government, to $9.23 per capita in West Virginia, which opted for a state-federal partnership.

About $4.8 million in public money will be spent trying to sign up New Jersey's 1.3 million uninsured, for example, compared to the nearly $28 million spent reaching out to Washington state's much smaller 960,000. Texas has the highest percentage of uninsured people in the nation, three times more than Illinois. But only a fourth as much public money will be spent on getting people enrolled in Texas.

Ads based on research about the uninsured will soon start popping up on radio, TV and social media. Grassroots organizers are recruiting their pastors, barbers and mothers and arming them with carefully worded messages. The pitch: If you don't make much money, the government can pick up some of the cost of your health insurance. If you can afford a policy, by law you have to get one.

People will be directed to healthcare.gov, a government site, for more information.